04.07.2014
The rig pulls a printed object up from the ooze on the build platform where resin is cured with visible light. Check out this fast-motion build video to see how each layer is exposed to light, then pulled upward to make room for the next.
The project’s technical and detailed website is a pleasure to browse, including interesting descriptions of problem solving. Despite the implementation of a peeling mechanism that aimed to “peel” the part from the optical medium, the cured resin continued to stick to both the build platform and the optical medium. In exploring ways to overcome this main issue we began by exploring a different method of curing referred to as the top-down method.
The exposure time, % of photo initiator and % of photo inhibitor all work together to create the layer thickness. We had some JMP UV stamp resin, although it didn’t cure solid with the normal projected image in our test. As a next step, we removed the DLP’s mercury arc lamp and drove it positioned just a few cm directly over the resin. With the interlock defeated and proper safety precautions, the result was a very quickly cured puck of resin.
We probed various parts of the light path with a blob of resin to see where it would cure into a solid mass. Excessive UV causes corrosive outgassing of lubricants sealed inside the dmd chip which will deteriorate the reflectivity of the micromirror array.
What is NYC Resistor?NYC Resistor is a hacker collective with a shared space located in downtown Brooklyn. Sorta seems like it has, bottom to top: the projector, a transparent reservoir full of magic goo, the downward-facing build platform.


I agree the goo costs more but it is different than just normal plasic proably specal handleing etc. Also I imagine it wouldn’t take long for someone with a reprap to make something that can hold a glass bottom and have the extruder head or something in place of it hold a bolt to pick it up. You basically just need a black & white image of the whole layer with the parts you want solid in white.
And if you had a decent feed system for the goo, you wouldn’t need much more than the volume of the object. Same exact concept as this professional machine that has been on the market for almost 10 years now. Two reasons for DLP: Higher UV output (LCDs need UV filters to prevent the LCD degrading, DLPs are almost immune to UV so little filtering is needed), and much higher contrast than LCD (or more importantly, much lower black levels).
First of all, thank you very much for posting the information and comments about the 3d printer that I am working on… as you can see I already got some great results but still have some room for improvements. 1) I am not using UV light and UV resin, but visible light resin (cures with wavelength near UV (400nm)) and special visible light lamp that emits near UV light.
2) The bottom up process is very good as you don’t need to worry about resin level and quantity as you need on SLA.
DLP based SLA is not a new concept, and companies such as Zcorp have already introduced very similar products.
With that said, I would be extremely cautious when it comes to building a business model around offering this to hobbyists. But how do you stop the newly cured layer of resin sticking to the lower plate, where the image is projected through ? The bath needs to be a uniformed thickness so that it solidifies correctly when the light hits it from the underside.


The build time could be estimated at two hours – one can see a technician replace the extracted resin at regular intervals during the extended real-time process.
This resulted in the motor being unable to generate enough torque to raise the build platform. Previous groups had aimed to put the projector on the bottom and project images through an optical medium into a bath of resin (bottom-up curing). With a 2700 lumen DLP projector this resin will cure a 0.1mm thick layer in 2 to 4 seconds. Most dmd chips can be replaced for around $100-200 so depending on the speed of this degradation and the ease of replacing the chip in your chosen projector this may or may not be acceptable. Looks like it drops the build platform so that it’s just a hair above the very bottom of the pool, fires the DLP projector for however long is needed to solidify the goo, raise Z up enough to detach from the bottom of the pool and let more goo flow in then drop Z back down for the next layer. Even a moderate res like 1024×768 shrunk to a 10^2cm area would produce a pretty fine resolution. The build table is made of glass sandwiched between gaskets where it comes in contact with the frame, keeping the liquid in place, while letting the DLP projector shine through. In this method the platform starts at the bottom of the bath of resin and moves up layer by layer. The top-down method eliminates the need for the optical medium and therefore does not require any shearing or peeling. I’m not sure printing like this even needs support structures but if it did, you could probably do them with making parts of the image gray.




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Comments Uv resin and dlp projector 3d printer kit

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